Enum Pat 

pub enum Pat {
    Ident(String),
    Object(Vec<PatField>),
    Array(Vec<Option<Pat>>, Option<String>),
    Rest(Box<Pat>),
}

A binding pattern.

Patterns appear on the left-hand side of destructuring declarations and in destructuring function parameters.

Variants

Ident(String)

Simple identifier binding: x.

Object(Vec<PatField>)

Object destructuring pattern: { x, y: z, ...rest }.

Array(Vec<Option<Pat>>, Option<String>)

Array/tuple destructuring pattern: [x, y, ...rest].

Elements are None for holes (e.g. [, y] skips the first element). rest is the name of the rest element (e.g. "rest" for [...rest]).

Rest(Box<Pat>)

Rest pattern: ...rest (used inside object/array patterns).

Implementations

impl Pat

pub fn ident(name: impl Into<String>) -> Self

Create a simple identifier pattern.

pub fn object(fields: Vec<PatField>) -> Self

Create an object pattern from a list of fields.

pub fn array(elements: Vec<Option<Pat>>, rest: Option<String>) -> Self

Create an array pattern from elements and an optional rest name.

Trait Implementations

impl Clone for Pat

fn clone(&self) -> Pat

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Pat

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Pat

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Pat

fn eq(&self, other: &Pat) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Pat

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructureEq for Pat

fn structure_eq(&self, other: &Self) -> bool

Compare two values for structural equality.

impl StructuralPartialEq for Pat